possible fix to soviet battles crash

- New ranks mechanic.
New officers (ltn, cpt, col) and each squad gets sergeants and corporals (ranks displays above heads). If simple privates are isolated (100m+) of officers and non-commisionned officers, they will lose orders and start to fall back to their officers. A radio message/text message as well as an exclamation point on the head of soldiers will show you if they're too far.
the rank mechanic is from Old Boy's Vietnam mod and is replicated in this mod with his nice permission.

- new balance pass on enemy troop/vehicles numbers on all conquest economic difficulties. Trying to find the right spot.
- update to conquest enhanced last update, fix AI behaviour in battle and putting backstab spawn back in.

- Reworked enemy CPs and MP in all difficulties so more enemies spawn (more turns in your conquest means more enemies now, so your enemy will become more dangerous with time). All difficulties are enabled so try them all to fine tune your experience.
- fix MAT49 range

Lowered protection for AI spawing units to prevent farshooting while invulnerable

Comp to last west-81 update

- fixed 155mm M1918 firing profile so it works at the correct range.
- fixed D921 wheeled cannon not reloaded
- fixed lorraine 40t 100mm AP not reloading
- changed firing profile of D921 and 90mm M1 AA gun to arty

Trying to fix the damn MG3_drum crash at activation that randomly happen